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A STEAMBNGINE GOVERNOR; No. 434,252. Patented Aug. 12, 1890.

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)VILLIAM J. OREELMAN, OF ROCHESTER, NEW YORK, ASSIGN OR TO 'THE WOODBURYENGINE COMPANY, OF SAME PLACE.

STEAM-ENGINE GOVERNOR.

SPECIFICATION forming part of Letters Patent No. 434,252, dated August12, 1890.

Application filed February 7, 1890. Serial No. 339,518. (No model.)

To @ZZ whom it may concern.-

Be it known that I, WILLIAM J. CREELMAN, of Rochester, in the county ofMonroe and State of New York, have invented a new and useful Improvementin Steam-Engine Governors,which improvement is fully set forth in thefollowing specification, and shown in the accompanying drawings.

My invention relates to wheel-governors for steam-engines or that classof centrifugal governors in which a vibratory or swinging eccentric issecured to a wheel of the engine, the eccentric being controlled byweights and springs.

The invention consists in providing certain improved parts and devicesfor the purpose of overcoming various difficulties heretoforeencountered in engine-governors and to otherwise improve theconstruction of the governor, the features of novelty being herefinafter fully described, and more particularly pointed out in theclaims.

Referring to the drawings, Figure 1 is a side elevation of my improvedgovernor attached to the iiy-wheel of an engine, parts being sectionedon planes parallel with the plane of the wheel, parts being broken away;Fig. 2, a view of the same, (seen as indicated by arrow w in Fig. 1,)the wheel'with some other parts being sectioned as on the dotted line yy in Fig. 1. Fig. 3 (sectioned on the dotted line .e in Fig. 1) showsthe knife-edge bearing of the spring; Fig. 4, a view of the part-s shownin Fig. 3, parts being sectioned on the dotted line rr fr; Fig. 5, aview of the parts, (seen as indicated by arrow in Fig. 4.,) the sectionbeing on the dotted line y y', Fig. 6, a plan of the adjustable holderfor the spring; Fig. 7, a transverse section taken on the dotted line inFig. 6; Fig. 8, an edge View of the auxiliary weight, (seen as indicatedby arrow z in Fig. 1;) and Fig-9, a plan of the outer louer forthepauxiliary weight, the arm of the wheel being sectioned, as on thedotted line a2 in Fig. 1. The gures on Sheet 2 are all drawn to largerscales than the scale of the figures of Sheet 1.

Referring to the parts, A, Figs. 1 and 2, is the inertia-wheel or otherwheel of a steam- 5oengine, to which my improved governor is attached,and B the crank-shaft. The eccentric-hub or eccentric O is held to turnupon a pin D, rigid in an arm of the wheel, the plane of the eccentricproper being parallel with the plane of the wheel, and all movements ofthe eccentric being parallel with said plane of the wheel. Y

E is a main centrifugal weight secured rigidly to the eccentric by abolt a.

F is an auxiliary centrifugal weight con- 6o nected with the eccentricon the other side by means of a lever b and link c, the lever beingpivoted upon a stud d, rigid in a projection e from an arm of the wheel.

G is a tension-spring connected at H with 6 the eccentric in a manner toact upon the latter contrary to that of the action of the weights, theaxis of the spring being in the plane of the wheel. The outer end of thespring is connected with the wheel'by means 7oV of an adjustable rest orholder g, secured to the rim by screws f f. These screws pass throughlongitudinal slots h h in the holder g and enter the wheel, by means ofwhich slots said holder is rendered longitudinally adjustable along therim of the wheel. A curved projecting seat c' for the holder g is formedon the rim of the wheel, it being eccentric with said wheel andpreferably about concentric with the bearing at H. This form 8o is given`the seat mainly foi1 the purpose of avoiding any material change in thespring as to tension when the adjustments of the holder are made. Theadjustments of the holder are in the plane of the wheel and cause 8 5the spring to move sidewise in said plane. These adjustments of thespring cause the angle formed by the axis of the spring extended and aline drawn through the axis of the pin D and the axis of the joint l-Ito be 9o more or less acute, according to the direction of theadjustment in any given case'. For instance, should the adjustment be inan upward direction, (referring to Fig. 1,) this angle would become moreacute, giving to the weights an advantage over the spring in theiraction upon the eccentric; or, should the adjustment be in the otherdirection, the angle would approach a right angle, giving the spring anadvantage over the weights.

As the weights move outward at any time on account of an 4increase inthe speed of the IOO engine, their centrifugal force and intensity ofaction upon the eccentric increase, and as the spring is drawn out fromthe action of the weights it likewise acts more powerfully upon theeccentric against the weights. New the aim in constructing governors ofthis class is to have the increase of the force of the spring keep paceas nearly as possible with the increase of the force of the weights, tothe end that the variations of the speed of the engine running undervarying loads or varying steam-pressure shall be as little as possibleon the one hand and that the engine shall not pulsate or race on theother. This constant balance between the force of the spring and theforce of the weights, I iind can be much more satisfactorilyeffeeted bydirectly connecting the eccentric with the wheel by means of aspring,and provide an adjustment for the latter to change its direction of pullupon the eccentric.

Owing to a lack of uniformity of elastic force in springs of the samesize no one position for a spring relative with the eccentric with equaltension is correct for all. I design to give the spring in each casesufficient tension for the requirements of the governor and to securethe required degree of sensitiveness for the governor by the sidewiseadjustment of the spring above described'. The spring is connected atone end with the eccentric and at the other with the rim of the wheel bymea-ns of head pieces or heads k l, respectively, the former being shownin detail in Figs. 8, 4, and 5. These heads are each formed with spiralgrooves n, in which the turns of the spring at its respective ends rest.A threaded stem o, entering the head l, connects the spring with theholder g by passing through an opening p in a raised part of the helder,Figs. 6 and 7. By means of this threaded stem the spring is renderedadjustable as to its tension or the intensity of its pull upon theeccentric. The opening p is circular at the bottom, but made Haring orelongated in two opposite directions at the top, the elongation being inthe direction of the plane of the wheel, as shown. This tiaring form ofthe opening allows the spring to swing freely in the direction of theplane of the wheel, while the parallel or straight sides u u of theopening prevent the spring from swinging in a direction transverse tosaid plane. This restricted motion of the spring is mainlyfor thepurpose of guarding against accident. Should the spring break or becomedetached from the eccentric at any time while the wheel is in motion, itcan only sway backward and forward in the plane of the wheel, whichmotions would be harmless. If the spring were permitted to swing outwardat either side of the wheel serious damage might be done.v The stem isformed with a rocking head r under the holder to keep it in place. Thesurface of this head in contact with the holder is eonvexed or ridged,as shown in Figs. l and 7, so as to rock as the spring moves one wayorthe other on account of the motions of the eccentric or theadjustments of the holder g. The inner head 7c of the spring is formedsubstantially eylindrical at its upper end and hollow, as shown in Figs.3, 4, and 5, the axis of the opening being at rightangles to the axis ofthe spring. This open head surrounds the stud H, which is rigid with theeccentric. The stud is provided with a knife-edge piece s,seatedlongitudinally therein, preferably made of hardened steel, and the.opposing surface of the head is provided with a hardened-steel bart tomeet or bear upon the knife-edge. This construction renders the frictionbetween the two parts of this important joint substantially nominal andadds much to the sensitiveness of the eccentric acting under the controlof the centrifugal weights. The stress upon the spring is constant andalways in the same direction,which causes the knife-edge to always bearagainst its companion piece t.

The lever I?, Figs. l and 2, is formed with a projecting part 'u at itsouter end to prevent the weight F from slipping off should said weightat any time become loosened. The weight is made with a diametricalopening w through it suflieiently large to be passed over the projectiono, the weight being adj ustable upon the lever and secured to the latterby a detent-screw a. b is a cushioned stop or buffer for the weight whenin its extreme outer position. This stop is made rigid with an arm ofthe wwheel by means of a bolt c and is faced with a rubber cushion cl toreceive the weight. e is a cushioned stop for the weight when atitsinnermost position. This stop, which may he solid or tubular, ispreferably threaded into the hub f of the wheel and provided with aset-nut g', by means of which it may be longitudinally or endwiscadjusted. The rubber cushion h to receive the weight is inserted in acavity in the outer end of the stop, as shown.

The auxiliary weight F is formed with straight tangential parts t' t',parallel with a central longitudinal line of the lever, so as to fairlymeet the stops b and c in any position to which the weight may beadjusted upon said lever. These straight parts or sides of the weight,acting conjointly with the respective stops, are important andconstitute a inaterial part of my invention.

The hub f of the wheel is formed with a tongue 7s', projecting radiallyoutward parallel with the arm of the wheel, to aid in firmly supportingthe pin D for the eccentric. The latter is divided, as shown in Fig. 2,to slip over the end of the tongue, which prevents any longitudinalmotion of the eccentric upon said pin during the operation of thegovernor.

The part Z of the eccentric is depressed, so that the studs H n shallclear the eccentricstrap I, Fig. 2. A similar and correspondingdepressed part r is formed at the other side of the eccentric at whichthe spring and thc IOO IIO

lever b are connected when the engine is intended to`be run in the otherdirection, and the eccentric-hub is also formed with an opposing seat ofor the main Weight E. A stud p is inserted in one of the holes in thepart fr and provided withy an india-rubber ring s',

`Fig. 2, which constitutes a stop or buer for the eccentric when swungto its position of greatest eccentricity. This stop encounters the hubof the Wheel, a concaved recess t being formed therein to give therubber ring a greater breadth of bearing. This stop for the eccentricacts conjointly with the stop e', above described, to arrest the outwardmotion of the eccentric. The stop e being adjustable, it may be set toact simultaneously with the stop p.

What I claim as my inventionisl. Amovable eccentric on arevolving wheel,in combination with an operating centrifugal weight rigid With said.eccentric, an adjustable auxiliary centrifugal Weight to move theeccentric, a lever to hold the auxiliary Weight, a link connecting saidlever and the eccentric, and a spring to connect the eccentric with thewheel, substantially as shown.

2. An eccentric secured movably to a Wheel, in combination withcentrifugal Weights to operate the eccentric, one rigid with theeccentric and the other connected therewith by a movable link, and aspring to control the eccentric having a bearing at its inner end upon apart rigid with the eccentric and at its outer end secured to the Wheeland adjustable along a continuous concave seat eccentric With the Wheel,substantially as shown.

3. A movable eccentric mounted upon a revolving Wheel, in combinationwith centrifugal Weights to move the eccentric, a spring to move theeccentric, a stud rigid with the eccentric, an open circular head forthe spring to encircle the stud, the latter being provided with ahardened knife-edge piece separate from the stud and embedded in itsconvex surface and projecting therefrom, and the open head provided Witha separate hardened piece embedded in its concave surface, said hardenedpieces being in contact, substantially as shown, and for the purpose setforth.

4. An eccentric secured movably to a revolving Wheel, in combinationwith centrifugal weights to move the eccentric, a spring to act uponsaid eccentric against the Weights, an adjustable holder for the springsecured to the Wheel, and a curved seat on the Wheel for the holder.

5. An eccentric secured movably to a revolving Wheel, in combinationWith centrifugal Weights to move said eccentric, a spring to act uponthe eccentric contrary to the Weights, and a detachable holder for thespring p secured to the wheel.

6. A pivotal eccentric on arevolving Wheel,

and adjustable with reference to the angle formed by said axis and aline drawn through the center of motion of the eccentric and the jointbetween the eccentric and spring.

7. An eccentric secured movably to a rel volving Wheel, in combinationwith centrifugal Weights to operate said eccentric, a spring to act uponthe eccentric contrary to the Weights, a holder for the spring securedto the wheel, and a stem connecting the spring and holder occupying anoblong opening in the holder having its longest dimensionv in the planeof the Wheel, and a rocking head for the stem to bear against saidholder.

In witness whereof I have hereunto set my hand, this 1st day ofFebruary, 1890, in the presence of two subscribing Witnesses.

WILLIAM J OREELMAN. Witnesses:

E. B. WHITMORE, M. L. McDERMo'rr.

